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<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<body>
<script>
  // var obj = {
  //   name: 'shujun',
  //   age: 19,
  // }
  var obj = new Object(); // 创建了空对象 {}
  obj.name = 'xy'
  console.log(obj);
  console.log(obj.__proto__.toString);
  
</script>
</body>
</html>